package thread;

import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 线程池:
 主要解决: 1.重用线程  2.控制线程数量
 */
public class ThreadPoolDemo {
    public static void main(String[] args) {
        //创建线程池
        //创建固定大小的线程池,容量为2
        ExecutorService pool = Executors.newFixedThreadPool(2);
        for(int i=0; i<5; i++) {
            Runnable r = new Runnable() {
                public void run() {
                    Thread t = Thread.currentThread();//获取运行该任务的线程
                    System.out.println(t.getName() + ":正在执行任务...");
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(t.getName() + ":执行任务完毕!");
                }
            };
            pool.execute(r);//将任务交给线程池
            System.out.println("指派一个任务给线程池...");
        }
        pool.shutdown();
//        pool.shutdownNow();
        System.out.println("线程池停止了!");
    }
}
